Our second webinar zoomed in on the strategic opportunities, designs, and key actors in mainstreaming NBS for sustainable urban planning. Keynote speakers returned, joined by Ms. Yuni Sri Handayani, while Mr. Tony Widjanarso and Dr. Hendricus Andy Simarmata contributed as discussants. These webinars ignited vibrant discussions and exchanges of ideas. Dr. Saut Sagala underscored the need for cross-boundary collaboration, emphasizing that collective efforts hold the key to addressing current challenges. As NBS is still an evolving concept, the webinars highlighted the importance of integrated policy support and multidisciplinary collaboration in its future implementation.