Dangerous zone refers to a zone that puts you at risk of your life. If possess items in your inventory, some of them you could be losing.
The most hazardous zone can be found in the God Wars Dungeon also known as
OSRS Buy Gold. It is a place where you can suffer a fatal death due to the monsters of high levels in there. Everyone gets warnings prior to entering into a hazardous area, an area of wilderness or a dungeon. (PVP) You have to click on the "CONTINUE" in order to proceed.
Like when you walk into another floor within the Stronghold of Security, in Barbarian Village. The majority of the risky areas are also places, and activities that allow players to earn lots of money by just killing monsters and collecting drops. Coomon one example is GWD. There is a way to earn millions of gold out of godsword swords, hilts, along with the other items that are listed under the drop tab in RuneScape wiki.
To be honest, you have to get rid of a large number of them in order to collect a decent drop because all high-priced drops are on rare drop table. Many people are tricking new RuneScape players into entering the danger zones (luring) such as the old Wildernes, Red Portal and similar ones, where players would die and forfeit their items. High-level ones (lurers) takes the dropped items. This is a crime that can be reported under Honour.
Survivor. Boss killing like fighting or battling are very dangerous if you don't provide armour or food. Sometimes, you'll require the exact items that you need, or you'll be to end up dying. The most dangerous places are dungeons with
Buy RuneScape Gold. You need a source of light. If the light source goes out or you lower it to the minimum, you'll continually be hit for 1-10 life points until you pass away. And as it was mentioned before, one more of the most dangerous areas is the ClanWars red portal. If you do die in the portal you'll lose all your belongings.