Predelta National Park, National park in Diamante Department, Argentina

Predelta National Park lies on the left bank of the Paraná River in Diamante Department, Entre Ríos, 6 km south of Diamante city, at the start of the Paraná Delta. It covers 24.58 km² of mainland, floodable shores and the islands of Del Ceibo, Las Mangas and Del Barro, all enclosed by rivers. Its terrain runs from high albardón ridges with gallery forest down to lagoons and low bañados, with sandy beaches colonised by willows and alders.

The park was formally established by federal law in December 1991 and began operating in January 1992. Its creation was part of a national effort to protect the ecologically fragile zone at the start of the Parana Delta.

The park's name comes from its position at the start of the Paraná Delta, where river sediments begin forming islands. Its emblematic bird is the matraca kingfisher, the largest of the three kingfisher species recorded here. The arroyo La Azotea and riacho Vapor Viejo, where a British ship sank, are among the navigable waterways bordering the park.

Access from Diamante is via a six-kilometre dirt road leading to the La Jaula and La Azotea areas near the park; Diamante itself lies 44 km from Paraná along provincial route 11. Entry is only allowed under ranger supervision, and the park has a management plan approved in 2019. Trails can be muddy after rain, so sturdy footwear helps.

This park sits at the very point where the Parana Delta system begins, one of the largest river delta systems in the world, showing all its early formation stages in one place. The raised ridges here are built by river sediment and are still slowly growing, meaning the land itself continues to change.