The number three ringed mountain centering on Tangxia town, with east-west length about 23 kilometers, and the south-north about 16 kilometers; the structure is not very intact, appears a fragmentized ellipse.

• 第三号环形山以塘夏为中心，东西径约23公里，南北径约16公里；环形山构造不完整，呈破碎状椭圆形。