We stopped to check out a portage along a paddling trail we hope to try. Oh, my gosh.  Even with head nets and spray we are just black with mosquitoes.  It is indeed enough to make you go crazy swatting and jumping around to get away from them.  Yuck.  There was no escape.  Hundreds came into the car with us.  We swatted wildly for a long time just to get back to HORRIBLE.