At its maximum extent , it is about NUMBER@1 km -LRB- NUMBER@2 miles -RRB- long , and NUMBER@3 km -LRB- NUMBER@4 miles -RRB- wide .

It has a surface area of about NUMBER@5 km ² -LRB- NUMBER@6 mile ² -RRB- . At its biggest extent , it is about NUMBER@1 km -LRB- NUMBER@2 miles -RRB- long , and NUMBER@3 km -LRB- NUMBER@4 miles -RRB- wide .
