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"The rainbow is seen by day, and it was formerly thought that it never appeared by night as a moon rainbow.
This opinion was due to the rarity of the occurrence: it was not observed, for though it does happen it does so rarely.
The reason is that the colours are not so easy to see in the dark and that many other conditions must coincide, and all that in a single day in the month.
For if there is to be one it must be at full moon, and then as the moon is either rising or setting. So we have only met with two instances of a moon rainbow in more than fifty years"

Aristotle - Meteorology, book III  (350 b.C.)

Moonbows may be seen in waterfalls and cloud forests areas like Yosemite and Cumberland Falls in U.S.A., Victoria Falls in Africa, Plitvice Lakes in Croatia and in the cloud forests of Monteverde and Santa Elena in Costa Rica.
Other places where it is common to see moonbows are the Waimea Canyon State Park (Hawaii), Skogafoss Waterfall, (Iceland),  Wallaman Falls (Australia) and Jerome (U.S.A.).

Okavango Delta, Botswana

It seems a bit strange that a river doesn't reach the sea, but this is what happens to the Okavango, the fourth longest river on the African continent. It rises on the Angolan mountains to finish his race in Botswana, flowing into a sea, yes, but a sandy one: the Kalahari desert.

The origin of this phenomenon dates back to the ice age, when the river flowed into the great Makgadikgadi lake (now a desert).

At its mouth, it forms an internal delta, a cradle of incredible biodiversity considered one of the best preserved natural areas where huge quantities of animals can be found, of practically all the species of the African continent.

© Mario Micklisch

Okavango Delta from space © ESA, CC BY-SA 3.0 IGO

Asian Monsoon

Often travellers have many doubts about the best seasons to visit Southeast Asia .... let's clarify.

The Monsoon is a seasonal wind accompanied by changes in atmospheric circulation and precipitation due to the heating of land and sea.

On earth, there are many monsoon areas: the Gulf of Guinea, the Gulf of Mexico, Venezuela, Australia, Somalia, Spain, Portugal and northern Russia, but the area with the heaviest monsoon is Southeast Asia, due to the huge continental mass.

summer monsoon

In the summer season, the Asian continent is warmer than the sea, becoming a low-pressure zone and creating fresh and humid winds from the sea, with heavy rainfalls. 

winter monsoon

In the winter season, the Asian continent (high-pressure zone) cools, while the Indian Ocean (low-pressure zone) keeps their waters rather hot, creating dry and cold winds from the continent to the sea.

Best times to visit the Southeast Asian countries:

South: from January to September
Northeast: from March to August
Kashmir areas: from May to September
Himalayan areas: from April to November

Southwest: from December to March
Northeast: from April to October

from September to November

from November to February

North: from November to February
South: from March to May

from November to February

South: from December to April
Central Coast: from June to October
North: from May to October

from May to October