Azure Intra-Regional Egress

Hello,

was wondering if someone could help me decipher how this works. So, recently we have been starting to move some resources up into azure and currently today we have a hub spoke topology. We have seen quite the uptick in charges for Intra-regional egress costs specifically around the vnet hub and after digging further I can see that it correlates with virtual network peering. is this traffic between other vnets I'm assuming? I was hoping to find another vnet to correlate with the cost but I have not yet.