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Alligator Lake, also known as Tadlac Lake, is a freshwater crater lake located in Barangay Tadlac, in the Municipality of Los Baños, Laguna province, Philippines. The lake-filled maar is located along the southern shore of Laguna de Bay, the largest lake in the country, with Alligator Lake protruding out of the shore of the larger lake. If not for its slightly-elevated crater rim, Alligator Lake would be wholly engulfed by Laguna de Bay.〔("Alligator Lake, Los Baños, Calabarzon, Philippines" ). Google Maps. Retrieved on 2013-12-31.〕 The crater lake is one of the maars of the Laguna Volcanic Field. It is listed as one of the inactive volcanos in the Philippines by the Philippine Institute of Volcanology and Seismology (PHIVOLCS).〔("Inactive volcanoes of the Philippines" ). Philippine Institute of Volcanology and Seismology. Retrieved on 2013-12-31.〕 Lake overturns or carbon dioxide (CO2) eruption from deep within, locally called as ''langal'', normally occurs during the months of December to February. During this period some indigenous fishes of the lake are often observed gasping for air near the lake surface.〔Santos-Borja 2008, pg. 6.〕 Prior to the introduction of aquaculture, Alligator Lake was considered as an oligotrophic lake, having low nutrient content and low algal production, resulting in very clear water with high drinking-water quality. ==Geography== Alligator Lake is located in Barangay Tadlac, in the hot springs resort town of Los Baños ('The Baths' in English) near the border with Calamba City in the province of Laguna. The lake is directly situated below the northeastern slope of Mount Makiling, the highest mountain in the Laguna Volcanic Field. Because of its origin, the lake has no outlet and is replenished only by rainfall. The slightly oval lake is in surface area with a perimeter of about . It has an average depth of so swimming is not recommended because of its depth and the sudden drop along its shoreline.〔 The lake surface's longest dimension is in the NE-SW direction with the widest dimension perpendicular to the longest at .〔 The crater rim that separates Alligator Lake from the surrounding Laguna de Bay is thinnest northeast of the lake with only about wide piece of land separating it from the larger lake.〔 The Tadlac Barangay Road runs east of the lake but does not circle the lake. Another road runs west of Alligator lake. The lands around the lake are privately owned,〔Santos-Borja 2008, pg. 2.〕 and some owners have established resorts around the lake. The Laguna Lake Development Authority (LLDA), as mandated by the government, manages Laguna de Bay and its surrounding areas including Alligator Lake. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Alligator Lake (Philippines)」の詳細全文を読む スポンサード リンク
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