Srimad Bhagavatam 10.11.35 - Desire for Selfless Service (download mp3) , (download flv) and (download mp4)
by Radha Vallabha Prabhu at ISKCON Chowpatty
tatra cakrur vrajavasam
In this way they entered Vrndavana, where it is always pleasing to live in all seasons. They made a temporary place to inhabit by placing their bullock carts around them in the shape of a half moon.
As stated in the Visnu Purana:
And as stated in the Hari-vamsa:
tatha kantakibhir drumaih
There was no need to make fences all around. One side was already defended by thorn trees, and thus the thorn trees, the bullock carts and the animals encircled the inhabitants in their temporary residence.