[3] The treaty barred the sale of slaves to Christians of any nationality,[5] recognized the sultan’s jurisdiction over the waters near the East African coast,[6] allowed for the installation of a British official in Zanzibar or the mainland,[3] and created the Moresby Line.
The line ran from the southernmost point of the sultan's territory in Africa – Cape Delgado in Mozambique – through the Indian Ocean to the city of Diu on the coast of India.
[2][6] The transportation of slaves west of the established line, a primarily Muslim zone of the Indian Ocean,[7] was at this point considered legal but prohibited on the eastern side.
[8] To enforce this rule, warships were given the authority to confiscate ships carrying slaves in illegal waters east of the line and punish the captain in the same manner as a pirate, by "death without the benefit of clergy".
[9] The extension increased the area in which the transportation of slaves was considered illegal by moving the endpoint of the Moresby Line west to the Port of Pasni on the Makran Coast.