Relying on the surveys taken in the summers of 1820 and 1821, the commissioners, Anthony Barclay of the United Kingdom and the American General Peter B. Porter met in New York City for four weeks in November and December 1821. They were guided by four principles: first, that the boundary would not divide islands; that the boundary would follow the most navigable channel; where several navigable channels existed, the boundary would go through the one with the largest body of water; and in cases where there were several channels, the boundary would be drawn to ensure that good navigation would be left to both parties. The commissioners also kept an informal process to apportion islands equally between the two countries. In their final report, the commissioners agreed to grant St. Joseph Island and Cockburn Island to Canada and Drummond Island between them to the United States. Importantly, they also placed the border along the western shore of St. Joseph between it and St. Tammany (today Neebish) Island.