conterminous

1. connecting without a break; within a common boundary;

"the 48 conterminous states"

"the contiguous 48 states"

2. having a common boundary or edge; touching;

"abutting lots"

"adjoining rooms"

"Rhode Island has two bordering states; Massachusetts and Conncecticut"

"the side of Germany conterminous with France"

"Utah and the contiguous state of Idaho"

"neighboring cities"

3. of equal extent or scope or duration