We're six, planning a trip to Turkey in early September. We simply love natural places and 'Bolu' seems simply perfect. From what I could find, it is the Abant lake area in Bolu that has beautiful mountains and lakes. Can anyone give me an idea on how we can reach there from Istanbul? If there is a bus, how often does it operate and what are the costs? I believe it is a three hour journey one-way? Thanks!