creating a google map like ampersandtravels

Hi

clients website : landandshores.com/tour/

My client wants to create google map exactly like ampersandtravels.com the same zoom the same markers, size can be bigger. :confused:

for 3 maps ie north island New zealand , south island New Zealand and Total New Zealand with their individual place markers.

They want north I land map to show only north island with all their markers eg as shown in screenshot, like wise soth and total

Please can you tell me how I can achieve that as I checked that is an iframe

Regards

Sunita