Are there any countries that require a visa before arrival?

Yes, several countries require a visa before arrival in Indonesia. 

Nationals from countries such as Afghanistan, Cameroon, Central African Republic, Colombia, Democratic Republic of the Congo, Djibouti, Eritrea, Ethiopia, and others must obtain a visa before traveling to Indonesia. 

This requirement is part of Indonesia's visa policy. Indonesia’s policy is generally lenient for many nationalities. Travelers from certain countries can enter without a visa for stays of up to 30 days. Others have the option to apply for a visa on arrival. Travelers from the listed countries should plan and apply for their visas through Indonesian embassies or Global Visa Corp to ensure compliance with entry regulations. 

Additionally, even if many other nations allow visa-free travel or the option to seek one upon arrival, visitors from the countries on the list are subject to stricter entrance restrictions. To prevent any issues when they arrive in Indonesia, travelers should check the requirements before obtaining a visa. A seamless travel experience usually depends on knowing the nationality-based visa criteria.