How can I build a mini river outside for my little sisters toys. We are currently trying to build a forest/ tribe scenery but are miserly failing at creating a river without it draining.

You could dig out sort of a small ditch and coat it in plastic. The plastic will make sure the water dosen´t seep through the ground.

Explanation:

Hope this helps! Have an Amazing day!!

Get some kind of clay (Natural or artificial)

Explanation:

So then when you dig the river, just put the clay on the bottom and sides.

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."