Swimming

Is it allowed to swim in the water on the terrain?

Yes you can swim in the pond that has Griet Titulair island in it, and in the harbor or at the beach near Engelbart field.

The other ponds are not for swimming because of the terrains irrigation system that is in those ponds (tube's and such)

Be careful when swimming out of the harbor or the Engelbart beach: the Nuldernauw is very wide, very deep and very cold. Also there might be currents you are not expecting and boats on the water that won't notice you until they hear 'bonk'.