Final answer:
Lake Võrtsjärv is the second-largest lake in Estonia, following Lake Peipus which Estonia shares with Russia.
Step-by-step explanation:
The country that has Lake Võrtsjärv as its second-largest lake is Estonia. Lake Võrtsjärv, located in the heart of Estonia, is an important freshwater body for the country and the region. Estonia's largest lake is Lake Peipus, which it shares with Russia.
While not as well-known as some of the Scandinavian countries such as Finland, Norway, or Sweden, Estonia still boasts significant natural resources and attractions of its own, including its beautiful lakes.