The island of Guilpat is subject to the kingdom of Corea, and is the largest in that archipelago, being about thirty miles in length and fifteen in breadth. It is composed of innumerable hills in every variety of form, such as cones, saddles, and tables. Most of these hills have forts built on their summits. From these, lights were displayed every evening, and it was astonishing the rapidity with which these signals were answered. I have seen the whole coast illuminated in less than five minutes, each hill appearing like a little volcano, suddenly bursting out. As soon as the boats had surveyed this part of the island, we shifted the ship to where the survey was being carried on; and this we continued to do during the whole time that we were employed in the survey, the boats returning on board every night. Good anchorage is to be obtained all round the island. Innumerable forts and batteries are built along the coast; every rising ground being surmounted with one, although the major portion of them were not supplied with guns. We found as we coasted along that all the forts were manned, the people being armed with matchlocks, spears, and arrows. On several occasions they fired their matchlocks, and the salute was returned by the 6-pounders in the barges, which never failed of putting them to flight. In the centre of the island the land runs to an enormous height, and terminates in a sharp peak, which, in consequence of its always having been enveloped with clouds, we did not see till several days after our arrival.