bring the heifer to a valley with running water that has not been plowed or sown, and break its neck there by the stream.
KJV
And the elders of that city shall bring down the heifer unto a rough valley, which is neither eared nor sown, and shall strike off the heifer’s neck there in the valley:
ASV
and the elders of that city shall bring down the heifer unto a valley with running water, which is neither plowed nor sown, and shall break the heifer’s neck there in the valley.