Cale'Tranquila (Kal-e-tren-gui-laa)
Geography
The Cale'Tranquila was the largest river of the world Siekzinea, it runs most times underground. The river's origins in the Ladeir'ochosa (La-dey-r-osh-osa) the highest mountains of the planet. The rivers fall from the Ladeir'ochosa in a waterfall named Catarata'dorío (Ka-tara-ta-do-ryo). Both the river and waterfall were both sacred to the Odarul, the dominant species of this planet. The river runs until the village of the Gardiaí'do Tribe, one of the seven large tribes. Right on the edge of the village the river falls again, in the Catarata'domarfil (Ka-tara-ta-do-mear-fill). Where it falls in the underground sea called Morte'demarfil (M-oe-rt-ee-dea-mear-fill), sea off the death.
Ecosystem
The Cale'Tranquila flows its way down to the underwater sea, Morte'demarfil (M-oe-rt-ee-dea-mear-fill), also called sea of the death. During this, the Cale'Tranquila flow, it crosses a vast forest. Which houses many species that call this planet their home, like the Le'tagre, a large cat much like a lion on Earth. Inside the water are living a variation of fish and underwater plants.
Localized Phenomena
One of the most famous sights of the Cale'Tranquila are the rainbows or as the Odarul call them, Arco'dvella (Ark-o-df-ella). The seven colors are standing for good luck. But when there is an Arco'dvella in reverse then it stands for bad luck.
Are the fish and plants a threat to ships, causing people to fall overboard? Or are they just a good way to get rid of a meddlesome priest?
Too low they build who build beneath the stars - Edward Young
That is something I didn't think about. Thank you Mika.