Answer:
1. 20 natural attols
2.
Thiladhunmathi Uthuruburi(Haa Alifu Atoll)
Thiladhunmathi Dhekunuburi(Haa Dhaalu Atoll)
Miladhunmadulu Uthuruburi(Shaviyani Atoll)
Miladhunmadulu Dhekunuburi(Noonu Atoll)
Addu Atholhu(Seenu Atoll)
Fuvahmulah(Gnaviyani Atoll)
Huvadhu Atholhu Dhekunuburi(Gaafu Dhaalu
Atoll)
Huvadhu Atholhu Uthuruburi(Gaafu Alifu Atoll)
Kolhumadulu(Thaa Atoll)
Nilandhe Atholhu Dhekunuburi(Dhaalu Atoll)
Hahdhunmathi(Laamu Atoll)
Nilandhe Atholhu Uthuruburi(Faafu Atoll)
Felidhe Atholhu(Vaavu Atoll)
Mulaku Atholhu(Meemu Atoll)
Ari Atholhu Dhekunuburi(Alifu Dhaalu Atoll)
Ari Atholhu Uthuruburi(Alifu Alifu Atoll)
Male Atholhu(Kaafu Atoll)
Faadhippolhu(Lhaviyani Atoll)
Maalhosmadulu Dhekunuburi(Baa Atoll)
Maalhosmadulu Uthuruburil(Raa Atoll)
3. Dhevihi