the Japan Current) and a branch of the Oyashio Current flow past the island only two to three nautical miles offshore, attracting countless marine species to the clear, warm waters. Except in typhoon weather, on a sunny day one can easily see the bottom of the ocean.
而且海水溫暖清澈，一年四季只要不是颱風天，在晴光瀲豔的日子，龜山島四周海水清可見底。