Under waｔer Geographiy Sea of Japan

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Japan Coast guard website

The description landing on Dagelet,H.M.S Actaeon ,1859.

Dagelet Island Chart ,H.M.S Actaeon's survery (UKHO Ref:D7467)
There are Boussole Rock(Jukdo) and Seal Point(south Cape) on H.M.S Actaeon's chart of Dagelet 1859. (UKHO Ref: D7467). Also description of "Sea of Japan"


And U.K Hydro office replied as follows;
I have located the survey conducted by HMS Actaeon in 1859 of Dagelet Island (UKHO Ref: D7467), low resolution images attached, and reviewed several Sailing Directions including the China Pilot first edition (1855); second edition (1858), third edition (1861) and fourth edition (1864). It would appear that details from HMS Actaeon's work are not included until the 1864 Edition.




The description in the secondary source, by Blankey William about landing on Dagelet Island , H.M.S Actaeon .1859.
(quote from; On the coast of Cathay and Gipango forty years ago, A record of surveying service in the China Yellow and Japan Seas and the seabord of Korea and Manchuria,
Blakeney, William, R.N 1902.)

(P191 http://www.archive.org/stream/oncoastscathaya00blakgoog#page/n244/mode/2up)
"The Actaeon have to for a few hours off Dagelet Island, which emerges in solitary grandeur from the floor(2.000 feet deep) of the Japanse Sea, and rises to 4,000 feet above it. It lies 100 miles distant from the mainland of Korea, is clothed with forest from the verge of perpendicular cliffs of 500 feet, and is 20 miles in circumference. On every side were herds of seals, filling the air with sorrowful sounding cries, perhaps from terror at our appearing. We could make no headway through the dense undergrowth. La Perouse discovered this island in 1786, but there is no record of his landing.
A few half-starved Korean fisherman were collecting sea-slugs, etc., for Chinese epicureans, but had only a ramshackleold junk in which to make the passage across a stormy sea in almost perpetual fog. A weild and lonely spot is Dagelet Island.


By the way the book was published on 1902, They use "Korea Strait and Sea of Japan"
See Page 160 for name of the chapter;http://www.archive.org/stream/oncoastscathaya00blakgoog#page/n208/mode/2up

,attached map 1 -p167.
http://www.archive.org/stream/oncoastscathaya00blakgoog#page/n218/mode/2up
attached map2-p346
http://www.archive.org/stream/oncoastscathaya00blakgoog#page/n404/mode/2up

Sea of Japan
Strait of Korea
China Sea

1901-12.Papers on Mollusca of Japan

Papers on Mollusca of Japan (1901-12) by Pilsbry, Henry Augustus, b. 1862

(P236)
Proceedings of the academy of Dagelet Island Now Known as Matsu-shima. A small and little-known island , in the Sea of Japan , east of Corea. See Travels, p.174 Adams visited the island, which is inhabited or at least used as a Haliotis-fishing station by Coreans, on the 28th of June, 1859. It is densely wooded, with a central peak 4,000 feet high. In the Travels, p. 178, a slug "with the mantle covering the whole of its back"(probably Philomycus) and a Zua (Coehlieopa) are mentioned.
In the paper on Japanese Helieidae only two species are given ;
Helix (Camcena) luchuana Sowb. (?).
Helix (Patula) elatior A. Ad.
It is the only locality for the latter species. The identification of H. luhuana is doubtful.

1882.Un Touriste Dans L'extreme Orient

Un Touriste Dans L'extreme Orient 1882
Japon, Chine, Indo-chine et Tonkin (4 Aout 1881-24 Jannier 1882)
Edmondo Cotteau
(PDF P6)
Le 6 aout, nous apercevons a tribord la cote de Coree, sous la forme de haules collines ideues, trop eloignees pour qu'on puisse en distinguer les details.Nous passons beaucoup plus pres, a habord, de la petite ile Dagelet. Il y a quelques annees, un bateau danois y fit naufrage; son equipage pat se refngier sur L'ile Argonaute, indiquee dans ces parages par les anciennes cartes anglaises, n'existe pas

1590-1592. Ignacio Moreira visit Japan

There are the description of "Sea of Japan" in the Historia de las cosas más notables, ritos y costumbres del gran reyno de la China ,published by Juan Gonzalez de Mendoza.Second devision Volume 3 was written by Martin Ignacio de Loyola. He did quoted the report about Japan by Ignacio Moreira who visit Japan during 1590-1592 and met Alexandro Valignano during his stay in Japan. Though Ignassio Moreira's Map of Japan is no longer exist, there are many Japanese map based on the information and design by Ignacio Moreira in Europe,e.g. Luis Teixeira and Dudley's map and so on.
said that

・第二部第三巻第12章
中略・・・さて、チナ国は残る第四の側（北部）で長さ五百レグア（約2800KM）におよぶ峻険な山脈によって囲まれている。そしてこの山脈は北東の部分から、ハボン（日本）の海（日本の？）北の方向にあたる）に達するまで、80レグア（約450キロ)の距離に渡り、若干の個所において、自然に切断されている。そこでこの国の巨大な富と無数の人民が（本書の第一部で詳述したように）この部分を閉塞したのである。
（ゴンザレス・メンドーサ　シナ大王国誌　大航海時代　書Ⅶ　岩波書店　P540）
（Later I will put original description）

1880.A Forbidden Land: Voyages to the Corea

A Forbidden Land: Voyages to the Corea (1880)
Ernst Jacob Oppert , Ernst Oppert


Dagelet Description;
(P16-P20)
http://archive.org/stream/aforbiddenlandv02oppegoog#page/n58/mode/2up/search/Dagelet
The third of the large islands lies on the east coast, about forty-five miles distant from the main land, under the 37-25 north lat, and 133-16 long. East, and is called Ollon-to by the natives. On several charts it is erroneously put down as belonging to Japan, which is not the case; generally it is marked Matsushima, while the French give it the name of Dagelet, and the Russians Dagette. It is nearly round, is about twenty-five miles in circumference, but of its interior very little is know to us on account of its steep and rocky approaches and inaccessible shores. Ollon-to is very celebrated in Corea for its great fertility; it is said to produce everything of excellent quality, and of a size so uncommonly large and almost gigantic, that the natives on the continent have finally concluded, and state it as their positive conviction, that and island rearing produce so extraordinary cannot be inhabited by common human beings, but must necessarily be peopled by a race of similarly gigantic size. To compare the farco, the goverment has actually issued a stringent prohibition against people from the mainland settling on the island, to avert any danger which might arise to the mother-coutry from the proximity of such a giant race! An official, with and escort, is indeed sent to Ollon-to from time to time, to see that this order is not violated, and to bring back as much of the produce as can be collected during his short stay there. Coreans of a sceptical turn of mind, however, affirm, and with some show of reason, that there are a good many settlers there in spite of the prohibition, who hide themselves in the woods on the approach of the commission of inspection, which, on its part, does not venture to pursue and capture the fugitives on account of the rumours prevailing.


*Notice "37-25 north lat, and 133-16 long " is french longtitude and calculate for U.K GMT to 37-25 north lat, and 130.56 long on GMT (-2°20' difference between Grinidge and paris)

1882.Corea, the hermit nation. Dagelet can be visible from Corean peninsula.

Corea, the hermit nation. I. Ancient and mediaeval history. II. Political and social Corea. III. Modern and recent history (1882)

by Griffis, William Elliot, 1843-1928

（P110)
http://archive.org/stream/coreahermitnatio00grif#page/110/mode/2up/search/island
From a point on the sea-coast nearby, in fair weather, the island cone of Dagelet is visible.

（P206）
http://archive.org/stream/coreahermitnatio00grif#page/206/mode/2up/search/perouse
Deer are very plentiful, and the best hartshorn for the pharmacy of China comes from these parts. Out in the sea, abut a degree and a half from the coart, lies and island, called by the Japanese Matsushima, or Pine Island, by the Coreans U-lon-to, and by Europeans, Dagelet, This island was first discovered by the French navigator, La Perouse, in June, 1787. In honor of an astronomer, it was named Dagelet Island. "It is very sttep, but covered with fine trees from the sea-shore to the summit. A rampart of bare rock, nearly as perpendicular as a wall. completely surrounds it, except seven sandy little coves at which it is possible to land." The grand central peak towers four sousand feet into the clouds. Firs, sycamores, and juniper trees around. Sea-bears and seals live in the water, and the few poor Coreans who inhabit the island dry the flesh of the seals and large quantities of petrels and haliotis, or sea-ears, for the markets or the main land. The island is occationally visited by Japanese junks and foreign whaling ships, as whales are plentiful in the surrounding waters. The Japanse obtained the timber for the public and other building at their new setlement at Gansan from this island.

http://archive.org/stream/coreahermitnatio00grif#page/350/mode/2up/search/perouse
It was during the summer of this year, 1787, that La Perouse sailed along the eastern coast of Cho-sen, discovered the straits which bear his name, between yezo and Saghalin, demonstrated that the Gulf of Tartary divided Saghain from the Asian mainland, and that Corea was not sea-girt, and named Dagelet Island and its comparison Boussole. He had a copy of Hamel's book with him. He noticed that signal-fires along the coast, which from headland to headland, telegraphed to the capital the news of the stranger with his "black ship". Not as yet, however, as afterward, did the government connect the appernce of European vessels with the activity of the Christians within the realm, although La Perouse sailed under the flag which eveer afterward was indissolubly associated in Crean minds with Christianity