Please sorry for disturbing you, name area of high population density in the north ii the limbe refinery iii the kimbi forest reserve iv the lagdo dam

Here are the areas of high population density relative to the locations you mentioned:

ii. North of the Limbe Refinery: New Town (a densely populated area in the northern part of the Limbe urban zone).
iii. North of the Kimbi Forest Reserve: The area immediately north of the Kimbi Forest Reserve is generally rural and sparsely populated. There isn't a specific area of high population density directly to its north.
iv. North of the Lagdo Dam: Garoua (a major city located north-west of the dam, which is a significant population center).