Jawoyn people have a wealth of knowledge about their environment developed over tens of thousands of years.

Their country includes Nitmiluk National Park and the broader Katherine region in the Northern Territory, and information about seasons, weather, rivers, animals and plants has been passed down from generation to generation.

Jawoyn Association chair Lisa Mumbin said the traditional knowledge calendar, which was launched last Friday at the Godinymayin Yijard Rivers Arts and Culture Centre, was produced by Jawoyn elders and Barbara McKaige from Calytrix Communication.

"It's important that knowledge about country and language are recorded. We worry about the loss of knowledge and culture as older people pass away and younger people no longer use Jawoyn as a first language," she said.

The Jawoyn seasons calendar is split into five major seasons; Jiyowk, Bangkarrang, Malapparr, Jungalk and Guran.

"We want to show others our culture, our language and our seasons. Right now on Jawoyn country, we are moving from Malapparr into Jungalk, hot dry weather time," Ms Mumbin said.

"Creeks will stop flowing over the next few months and the billabongs will dry out. Thunderclouds will then build high in the sky and Nitmi (Cicadas) will sing-up the rain. When they sing loudly, we know the rain is not far away and the country will soon be green again.

"Our children need to understand the environment they live in and this new calendar will help them to connect to country. When they are out on country with their families, they need to learn important stories, such as the relationship between Bamjon (Yellow Kapok Cochlospermum fraserii) and Goymarr (Freshwater crocodiles).

"Bamjon's bright yellow flowers in Malapparr tell us that Goymarr are nesting and laying eggs. When Bamjon fruits have dried out and cracked during Jungalk, we know that Goymarr eggs have also cracked or hatched," she said.

"I was taught this by my parents and elders and now I am teaching my grandchildren so when they grow up, they can teach their children. We need to keep passing on our knowledge."

Posters of the Jawoyn Seasons calendar will available for sale at the Nitmiluk National Park Visitors Centre.

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