Grootmelkboom is a riverside campsite on the Namakwa 4x4 Eco Trail, situated along the Orange River in South Africa's Namaqualand region.

The site takes its name — meaning "Big Milkwood Tree" — from a giant Namaqua fig tree that once served as its landmark feature, though the tree has since been partially destroyed by fire.

The campsite is a popular stop for overlanders and 4x4 adventurers tackling the Namakwa Eco Trail.

Access involves driving through thick river sand, and despite appearing close to neighbouring campsites on a map, the rugged terrain can make travel times significantly longer than expected.

The surrounding landscape is typical of the arid Orange River corridor, with sandy tracks and sparse vegetation characteristic of the Namaqua region.