Question: South Channel Fort is located 6 km north-east of a town on the shores of what port?

Context paragraphs:
Zawiszyn, Masovian Voivodeship: Zawiszyn is a village in the administrative district of Gmina Jadów, within Wołomin County, Masovian Voivodeship, in east-central Poland.  It lies approximately 6 km north-east of Jadów, 35 km north-east of Wołomin, and 57 km north-east of Warsaw.

Krusze, Masovian Voivodeship: Krusze is a village in the administrative district of Gmina Klembów, within Wołomin County, Masovian Voivodeship, in east-central Poland.  It lies approximately 6 km north-east of Klembów, 13 km north-east of Wołomin, and 35 km north-east of Warsaw.

Mokra Wieś, Masovian Voivodeship: Mokra Wieś is a village in the administrative district of Gmina Tłuszcz, within Wołomin County, Masovian Voivodeship, in east-central Poland.  It lies approximately 6 km north-east of Tłuszcz, 23 km north-east of Wołomin, and 44 km north-east of Warsaw.

South Channel Fort: South Channel Fort, also known as South Channel Island, is a 0.7 ha artificial island in southern Port Phillip, Victoria, Australia, 6 km north-east of the town of Sorrento.  It was part of a network of fortifications protecting the narrow entrance to Port Phillip.

Leśniaki, Będzin County: Leśniaki is a village in the administrative district of Gmina Siewierz, within Będzin County, Silesian Voivodeship, in southern Poland.  It lies approximately 6 km north-east of Siewierz, 24 km north-east of Będzin, and 36 km north-east of the regional capital Katowice.

Derkacze: Derkacze (German: "Dicking" ) is a village in the administrative district of Gmina Dobiegniew, within Strzelce-Drezdenko County, Lubusz Voivodeship, in western Poland.  It lies approximately 6 km north-east of Dobiegniew, 24 km north-east of Strzelce Krajeńskie, and 49 km north-east of Gorzów Wielkopolski.

Sorrento, Victoria: Sorrento is a township in Victoria, Australia, located on the shores of Port Phillip on the Mornington Peninsula, about one and a half hours by car south of Melbourne.  It is a largely upper-class, seaside resort area, but is also a quiet seaside township in the off-peak months of the year.  It was named by the Italian founders after the southern Italian town.

Hucisko, Zawiercie County: Hucisko is a village in the administrative district of Gmina Włodowice, within Zawiercie County, Silesian Voivodeship, in southern Poland.  It lies approximately 6 km north-east of Włodowice, 12 km north-east of Zawiercie, and 52 km north-east of the regional capital Katowice.

Białe Błota, Świecie County: Białe Błota is a village in the administrative district of Gmina Jeżewo, within Świecie County, Kuyavian-Pomeranian Voivodeship, in north-central Poland.  It lies approximately 6 km north-east of Jeżewo, 16 km north-east of Świecie, 56 km north of Toruń, and 60 km north-east of Bydgoszcz.

Starowola, Wołomin County: Starowola is a village in the administrative district of Gmina Jadów, within Wołomin County, Masovian Voivodeship, in east-central Poland.  It lies approximately 6 km north-east of Jadów, 36 km north-east of Wołomin, and 58 km north-east of Warsaw.

Supporting paragraphs: South Channel Fort Sorrento, Victoria
Answer: Port Phillip