() granite. Dongyin Distillery claims that 'Dongyong Liquor Outperforms Mao Tai'. () Yanxiu Tidal Echo Yanxiu Tidal Echo (Yansiou Echoing with Tidal Cave) () is behind the frogman troops of the special forces post. The term 'Yenshow' () means “swallow nests” in Matsu dialect. Yansiou Echoing with Tidal Cave is a typical sea cove, at the bottom of which is a crevice connected to the sea. Yansiou Echoing with Tidal Cave is known to the resonant sounds caused by waves slapping against the rocks. After a stroll to the top observatory, the view expands. Towards the east is the Laoshu (Rat) Sands Stone Forest (). Beihai Tunnel The 148-meter long Beihai Tunnel is in the west of Yansiouao () in Dongyin. It used to accommodate several cutters, but was abandoned after severe damage caused by a typhoon. It was reopened to the public after restoration in 2000. Inside the tunnel is equipped with trails and railings. At the end of the tunnel, eight statues of the construction workers commemorate the restoration. Dragon Sea Cave Dragon Sea Cave () is located in the south of Beiao () and under the Dongyin gas station. After long years of erosion, exposed black basalt bedrock forms a unique 'sea arch' (). When huge waves roll up, or during the fog season, the image of the sea arch flickers in the waves and fog, like a black mythical dragon playing in the water. Therefore, Dragon Sea Cave is nicknamed 'Marine Dragon Play at Sea' (). Ganen Pavilion When the tide ebbs, the stack standing in between connects Dongyin and Xiyin (Siyin), but standing alone at sea when the tide refluxes. An embankment was built in 1986 to link Dongyin and Xiyin (Siyin). To show their gratitude for the grand construction, the troops and inhabitants on the island built a pavilion on the stack, with a sitting statue of Chiang Ching-kuo inside. Crouching Crocodile In the west of Qingshuiao (Cingshueiao) () of Xiyin (Siyin) is Reclining Alligator Island (), named after its likeness of an alligator in repose. Legend has it that a fierce alligator had caused trouble for many years at Cingshueiao. The Jade emperor recited a spell and turned it into a stone. When it comes to a visit in Xiyin (Siyin), the best position to enjoy the sight of Reclining Alligator Island is along the high way and of the east of Cingshueiao.