Earth.
The largest part of the land on Earth is the Pacific Ocean, covering approximately 30% of the planet's surface area.
Currently, the Pacific ocean is the most active volcanic area on the planet. The land masses that are adjacent to the Pacific ocean are referred to as the "Ring of Fire".
pacific ocean is about 30 million sq km larger than all land on earth
A planet covered mostly with water is known as a "water world" or an ocean planet. These planets generally have a global ocean covering the majority of their surface with little to no land visible. They can be found in our own solar system, such as some of the moons of Jupiter and Saturn.
Earth
Oceans cover about 70% of planet Earth's surface. Many people refer to planet Earth as "the water planet" for this reason. The four main oceans on planet Earth are the Atlantic, the Pacific, the Indian, and the Arctic Ocean. Some people consider the southern portion of the Atlantic, Pacific, and Indian Oceans as another ocean they call the Antarctic (or Southern) Ocean but since there is no easily defined land mass surrounding the Antarctic Ocean it is usually not mentioned in geography.
The Earth is more than 75% water. The oceans on our planet make up more than the land on our planet. There is far more animals and species living in the ocean than on the land. Truth is, scientist believe that we only know of about 20% of the animals in the ocean.
Something like 326,000,000,000,000,000,000 gallons (326 million trillion gallons) of water (roughly 1,260,000,000,000,000,000,000 liters) can be found on our planet. This water is in a constant cycle -- it evaporates from the ocean, travels through the air, rains down on the land and then flows back to the ocean.
Venus is a land (rocky) planet.
The centre of the Northern Hemisphere is the northern rotational pole of the planet. This is situated in the Arctic Ocean, not a land/continental mass.
Earth (obviously).
Uranus hasn't got land, it is a gas planet. Which means you will simply fall into the core of the planet. If you tried to land on the planet.