Sandymount Cemetery was opened in 1878, and contains approximately 5,950 monuments, 350 of which are Muslim and 1,250 Jewish. Some burials were also re-interred there from the Christ Church Episcopal Churchyard in Bridgeton.
The Muslim graves at Sandymount dated back to the 1920s, many of the early burials being of sailors who had died aboard ship but required to be buried on-shore for religious reasons. Later migration from the Indian Sub-continent after WW2 introduced a permanent Muslim population into the city and Sandymount provides one of several sites available for Muslim burials.
Reference: https://www.gwsfhs.org.uk/2019/10/24/hebrew-cemetery/