League, Oosik
A league is an inexact measure of about three miles. That's very impressive whorl-analysis, vizcacha.
BTW, I'm pretty sure that the house where Silk is held prisoner is Oosik's house, that the room in which he lies is Mattak's room, and I suspect that the woman's scarf he finds will prove to be Hyacinth's scarf. I'm less sure about the blue tunic.
-alga-