Monaco has an area of 2.1 Km (0.81 sq mi) you can easily explore it in one day.
Vatican city has an area of 49 hectors (121 acres) with the population of only 764
San Marino has an area of 61 sq km (23.5 square mile). Total population 561 people living in it.
The size of Liechtenstein is 160 sq km (62 square miles) with population of 40,023.
It has a size of 468 sq km. with population of 79,034.
Luxembourg is 2586 sq km(998 sq mi) big and has a population of 672050. You can easily cover it in one day.
The country size of Malta is about 316 sq km (122 sq miles), attracting many tourists because of its beauty.
Belize is 22,966 km2 (8,867 sq mi) in size. It is only country in Central America without a Pacific coastline.
Brunei is a country in southeast Asia. With total size of 5,765 km (2,226 sq mi).
It has an area of 23,200 km2 (8,958 sq mi).