Lagoa Grande de Buriti dos Lopes is a natural lake located in the northern region of Piauí, in the municipality of Buriti dos Lopes. It is fed by the Rio Longá and drains into the Rio Parnaíba, placing it within a significant river system of the state. The lake is considered the primary tourist landmark of Buriti dos Lopes and holds considerable historical and economic importance for the surrounding community, having supported the cultivation of tobacco, cotton, and, most recently, rice over many generations.

The lake hosts the annual Regata das Canoas (Canoe Regatta), organized by the local fishing colony known as Colônia Z-4 de Pescadores. This event, which has reached at least its 29th edition, draws together local fishermen, residents, and visitors for canoe racing and cultural celebration, typically held in March. The presence of an active fishing colony indicates that traditional canoe-based watercraft are regularly used on the lake, and the regatta itself confirms that the water body is suitable for paddling activity.

During the winter rainy season, families commonly gather along the lake's shores for day outings, and the lake is noted for its sunsets, which are regarded as one of the more striking visual features of the area. The surrounding landscape includes natural vegetation, and from the nearby archaeological site of Pedra do Letreiro — located approximately 40 minutes from the lake — visitors who reach the summit are rewarded with views over the forest and the lake below.

The Barragem da Lagoa Grande de Buriti dos Lopes is a distinct feature associated with the lake, suggesting the presence of a dam structure. The lake sits within a broader network of water bodies in the region, with the Rio Longá located approximately 7.4 km away. Specific access points, paddling restrictions, and water quality data for the lake remain undocumented.