The Itabaca Channel separates the islands of Baltra and Santa Cruz in the Galápagos archipielago in Ecuador.
 The Itabaca Channel is crossed by water taxis who ferry passengers from Baltra (South Seymour) in the North to Santa Cruz in the South.
 The channel is around 400 meters its narrowest point.
Beagle Channel (Spanish: "Canal Beagle" ) is a strait in Tierra del Fuego Archipelago on the extreme southern tip of South America partly in Chile and partly in Argentina.
 The channel separates the larger main island of Isla Grande de Tierra del Fuego from various smaller islands including the islands of Picton, Lennox and Nueva; Navarino; Hoste; Londonderry; and Stewart.
 The channel's eastern area forms part of the border between Chile and Argentina and the western area is entirely within Chile.
Sutlej Channel is a channel or strait on the north sides of Broughton Island and North Broughton Island, or the Broughton Archipelago of the Queen Charlotte Strait region of the Central Coast of British Columbia, Canada.
 The channel separates those islands from the adjacent mainland and includes Greenway Sound.
 It was named for HMS "Sutlej".
Hat Island is a small (about 4 × 8 km) uninhabited island located in the Kitikmeot Region of Nunavut, Canada.
 The island is situated in Victoria Strait (Queen Maud Gulf) approximately 110 km southeast of Victoria Island and 80 km southwest of King William Island.
 The Requisite Channel separates Hat Island from Amundsen Island, the larger of the Nordenskiöld Islands.
William Sawelson (August 5, 1895 – October 26, 1918) was a sergeant in the U.S. Army during World War I.
 He received the Medal of Honor for valor in combat.
 The medal was posthumously presented to his father Jacob L. Sawelson at Governors Island.
Malta Channel separates the European island of Malta from the southern tip of Sicily.
 The channel serves as a sea route link to Europe for the Maltese.
 Virtu Ferries take people from Malta to Italy and vice versa.
Rambler Channel is a body of water in Hong Kong that separates Tsing Yi Island from Tsuen Wan and Kwai Chung in the New Territories.
 The channel separates the two landmasses by 900 metres at its widest point.
Saint Helen's Island (French: "Île Sainte-Hélène" ) is an island in the Saint Lawrence River, in the territory of the city of Montreal, Quebec, Canada.
 It is situated immediately southeast of the Island of Montreal, in the extreme southwest of Quebec.
 It forms part of the Hochelaga Archipelago.
 The Le Moyne Channel separates it from Notre Dame Island.
 Saint Helen's Island and Notre Dame Island together make up Parc Jean-Drapeau (formerly Parc des Îles).
La Certosa (Italian: "Isola della Certosa") is an island in the Venetian Lagoon, northern Italy.
 It is located north-east of Venice, less than 250 m from San Pietro di Castello and little more than 500 m from the Venice Lido.
 A 20 m channel separates it from the Vignole island.
 La Certosa has a surface of some 22 ha .
Governors Island is a 172 acre island in New York Harbor, approximately 800 yd from the southern tip of Manhattan Island and separated from Brooklyn by Buttermilk Channel, approximately 400 yd .
 It is part of the borough of Manhattan in New York City.
 The National Park Service administers a small portion of the north of the island as the Governors Island National Monument, while the Trust for Governors Island operates the remaining 150 acres, including 52 historic buildings.
 Today, Governors Island is a popular seasonal destination open to the public between May and September with a 43-acre public park completed between 2012-2016, free arts and cultural events, and recreational activities.
 The island is accessed by ferries from Brooklyn and Manhattan.

Question: What channel separates the island where Jacob L. Sawelson received his sons medal of honor, from Brooklyn?
Answer: Buttermilk