Australia only has a main range,the Great Dividing Range, located in the East; and some other mountains, like the mount Uluru.

A great part of Australia is desert or semi-arid. The northern part, with a tropical climate, has a vegetation which consists mainly on rainforests, grasslands, forests and mangroves.

Although a big part of Australia is desert or semi-desert, there is a great biodiversity. Some typical Australian animal species are the koala bear, the kangaroo or the duck-billed platypus.

The desert or semi-arid region is the most extensive: a 40% of its terrytory is covered by sand dunes. Oceanía is the dryest, with the oldest and less fertile lands, and flatest continent in the world. But the highest mountain of Oceanía is the Mount Jaya, with 4,884 m high.

The region of Melanesia is formed by the following 3 important islands and archipelagos:

·New Guinea. It's the second bigger island on the world, with 785 753 km². It's located in the North of Australia.

·Bismarck Archipelago. It's formed in general for volcanic islands, with a total surface of 49.700 km². This archipelago is founded next to New Guinea.

·Solomon Islands. It's territory is divided in more than 990 small islands that are spreaded along 2 archipelagos.

Diurnal temperatures in summer are around 32-40 ºC, and in winter 18-23 ºC.

Precipitations are relatively commons: the total average in a year is 200-250 mm.

The biggest mountain measure 1,617m tall. The rivers go very fast and that is the reason why there are lots of hydroelectric power stations.

It has a tempere climate. In Tasmania there are inactive volcanoes. The place where there are more mountains is the central. The most important rivers are Derwen and Huon in the coast and in the south Tamar and River Mersey

The Indian Ocean is conneted to the Pacific Ocean through the Malay Archipelago and between Australia and Antarctica. Is also connected with Atlantic Ocean in the expansion between Africa and Antarctica.

Madagascar and Sri Lanka are the biggest islands in the Indian Ocean.

The floor of the Indian Ocean has an average depth of 3400 metres below the sea level. The greatest depth is 7725 metres, an it's located in the Java trench in the south of Java, Indonesia.

The temperature in this ocean is generally warm, although close to Antarctica pack, icebergs can be found.

This ocean is significantly larger than Earth's entre landmass.

Temperature in the pacific ocean varies from -1.4ºC in poleward areas, to about 30ºC near the equator. Climates in the Pacific Ocean are tropical, subtropical, polar, equatorial, dry troical and continental.

Some of its important islands and archipelagos are:

·Palaos. Is situated in the occidental extreme of the Carolinas Islands. Near to the limit between Asia and Oceania, but it belongs to the last one, Oceania. Palaos is an archipelago with a surface of 488 km², composed by 340 islands, they are from volcanic origen. From these 340 islands, only 9 are habitated. It enjoys a tropical climate along all the year, with a medium temperature of 27ºC.

·Marshal Islands. They are located at the northeast of Austlalia, and on the North of Nauru. They are composed for 2 archipelagos called Ralik and Ratak. The insular dispersion comprend and area of around 1 million of km², but the emergided area don't exceed the 176 km².

The highest point in Australia is the Mount Kosciuszko, with 2228 m. The central nucleus of the Great Dividing Range has hundreds of peaks, and it is surrounded by many other smaller mountains, canyons, valleys and flatlands.

The erosion of the range due to the age makes most of the mounts not to be excessively sheer, and therefore, all the peaks can be climbed without the need of special mountain equipment

·Hawaii Arhipelago, it's formed by 8 main islands. All of these islands are from volcanic origen, but only are active the volcanos that are in the Southest half of the archielago. Hawaii have many differnts climates: Tundra, Desert, Tropical Rainforest and Temperate Zones.

·Cook Islands, situated between the parallel 9º and 23º, latitude South, this archipelago is formed by 9 volcanic islands. In total the Cook Isalnds have  240 km². It has a tropical climate with some winds (Typhoons).

·Rapa, all the island looks like a peak of a sunken volcano. Its climate is template, but it isn't enough warm to grow coral, like in other islands

It has been in poor health, suffering from overuse of its waters, pollution from pesticide, runoff and prolonged droughts. The river has a high salt content and declining water quality. The Increased rainfall in its catchment in 2010 has improved the flow, but the health of the river will depend on long-term management.

The water of the Murray River flows through several lakes that fluctuate in salinity including Lake Alexandrina and The Coorong before emptying through the Murray Mouth into the southeastern portion of the Indian Ocean, often referenced on Australian maps as the Southern Ocean, near Goolw

The lake was named in honour of Edward John Eyre, who was the first European to see it, in 1840. The lake's official name was changed in December 2012 to combine the name "Lake Eyre" with the indigenous name, Kati Thanda, Native title over the lake and surrounding region is held by the Arabana people.

In the northern island there are less mountains because of its volcanic origin. The biggest mountain in the north is Ruapehu (2.797 m) that is a volcanoe.

The biggest lake is Taupo lake that was formed by volcanic origen.

The climate is cool temperated in the south with an average of 8ºC and warm temperated in the north with an average of 16º.

It has a tropical climate. The tallest mountain is Mt. Wilhelm with 4.509 m tall. Almost all the mountains in Papua New Guinea mesure more than 3.000 m.

The lonest river flowing into this sea is the Burdekin River.

It has a sub-tropical climate and it's frecuently hitted by tropical cyclons, specially between January and April. The annual rainfall typically ranges between 1,000 and 3,000 dependig on the area. Most precipitations falls from december to March. The number of clear days per year varies between 80 to 125 days and the typical temperature variation through the year are 18 to 27ºC.