This is the 1059th most frequent Turkish word.
bölgede
"In the region" or "in the area."
The word 'bölgede' describes the location of the festival and is the dative case of 'bölge', meaning 'region' in Turkish.
Bölgede bir festival düzenleniyor.
A festival is being organized in the region.
Here, 'bölgede' locates where the research activity of the team took place, 'in the region'.
Ekip, bölgede araştırmasını tamamladı.
The team completed its research in the region.
'Bölgede' in this context specifies the area where the referenced people live.