Also known as the Temple of the Jade Mound; Den Ngoc Son is a small temple on an islet in the middle of Hoan Kiem Lake. The temple is open daily from 8am to 6pm, and there is an admission charge. The patron of Den Ngoc Son is believed to be Tran Hung Dao, a legendary general. Within the temple is a sculpture of a fabled tortoise from the legend of the lake. The temple grounds offer great views of the surrounding lake, and the little lakeside park on the island is a popular place for elderly men to enjoy a game of Chinese chess.