Going to the north of the district, the road through Ba Thien industrial zone gradually enters the Mo Qua mountain area, in the Tam Dao range, the air cools down when in the village area at the foot of the mountain. Thanh Lanh - Ngoc Boi is a lake complex mixed with hills and mountains. Thanh Lanh lake is located in the northern area of Thanh Lanh village about 200m in Trung My commune, Binh Xuyen district, Vinh Phuc province. The lake is formed from a combination of valleys and small hills, built in 2000 with the function of serving to regulate water for irrigating arable land and to regulate the climate of the entire Northern district, at the same time. contribute a part to flood control for the plains of Vinh Yen and Phuc Yen.

Around Thanh Lanh lake is deep blue, fanciful, dreamy in the middle of a mountainous area surrounded by mountains, cool air, beautiful scenery, quiet and wild. Coming here, visitors can mingle with nature, explore the amazing natural beauty, separate from the noisy world of the city.
It was in this charming mountain place, which was dangerous in the past, that the leader of the insurgent army of Heo District, Nguyen Danh Phuong, chose to build a heroic garrison every ten years against the Le - Trinh court. There are many relics gathered by the lake side: Army duel, Elephant bathing area, Porridge beach, Horse trouser head, Mint warehouse... Oil is ruins, time is deposited, career of Leaders and Rebels. left a lot of love and mourning among the people around the area:
                                       The valley walker is still here
                  The sacred soul of mountains and rivers is full of love...
                                                    (Phan Ke)