This chapter continues the vision of chapter 15. Together they give the seven plagues that complete the wrath of God. (See: [[rc://en/tw/dict/bible/kt/wrath]])
Some translations set poetry farther to the right than the rest of the text to show that it is poetry. The ULB does this with the poetry in verses 5-7.
This is a Hebrew word. It is the name of a place. John used the sounds of the Hebrew word and wrote them with Greek letters. Translators are encouraged to transliterate it using the letters of the target language. (See: [[rc://en/ta/man/jit/translate-transliterate]])