The Supreme Court has original jurisdiction to hear matters between states, and the authority to accept a commissioner's report for determining state lines.
The state of Minnesota sued the state of Wisconsin in order to determine the true boundary between the two. After a commission was created to determine a boundary between the two states, the court granted a motion to confirm the report of the commission.
Can the Supreme Court order the boundary between states based on a Commissions report?
The Supreme Court ordered that the Commission's determination become the official boundary between the states, and that costs for the commission be split between the states.