I understand how to do double integrals, but finding the limits of this region is confusing me... the question asks

Find the volume of the solid bounded by the cylinder y ^2 + z^ 2 = 1 and the planes x = 2y, x = 0, z = 0 in the first octant.

When I sketch this out, it goes infinitely doesn't it....

someone help clear the cobwebs from my brain?

Thanks