Spice and Wolf, Vol. 6 (light novel) — Isuna Hasekura

As Holo and Lawrence begin the final leg of their journey, Lawrence
decides to accompany Holo to her ancient home of Yoitsu, if only to
forestall their parting just a bit longer. Boarding a ship from the port
of Lenos (much to the chagrin of the wisewolf, who is none too fond of
water!), the pair's fate becomes entangled with that of a boy named Col,
whose tale of his circumstances - combined with the gossip of the
sailors - leads to a shocking revelation about Holo's homeland!