The “Pure Abodes”; a name given to a group of Brahma-worlds—the five highest Rūpa worlds—consisting of Avihā, Atappā, Sudassā, Sudassī and Akaniṭṭhā. DN.iii.237

There anāgāmīs are born, and there they attain arahantship.

The Buddha is mentioned as having visited the Suddhāvāsā. DN.ii.50

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