Syria is laying landmines near its borders with Lebanon and Turkey, along routes used by refugees to escape the violence, Human Rights Watch reports.
Hundreds of refugees a day are arriving in Turkey and Lebanon from Syria.
The New York-based group quoted accounts from witnesses and deminers.
UN-Arab League envoy Kofi Annan is in Turkey and has met Syrian opposition figures during his peace mission. He says he expects Damascus to reply on Tuesday to his proposals on the crisis.
Meanwhile, the UN says 230,000 Syrians have fled their homes in the past year.
The UN High Commissioner for Refugees says 30,000 have fled abroad while 200,000 are displaced within Syria.
The UN says more than 8,000 people - many of them women and children - have been killed since the anti-government protests erupted.