This is the 4206th most frequent Russian word.
туапсинском
"Туапсинском" refers to something related to Tuapse, a town in Russia.
The word 'Туапсинском' is used here as a local adjective referring to the Tuapsinskiy district, which is a geographic area.
Я провёл неделю в Туапсинском районе.
I spent a week in the Tuapsinskiy district.
Here 'Туапсинском' is an adjective describing the coast related to the Tuapsinsk region, pointing to its geographical significance.
На Туапсинском побережье чистая вода.
The water is clean on the Tuapsinskiy coast.
In this example, 'Туапсинском' modifies 'лесу', signifying that the forest is located within the Tuapsinsk region.