Spatial - Polygon relationships

[Anudeep_Yalamuru]

Good morning All,

This is a Spatial Challenge. I have around 3000 polygons forming a geography of interest. 

Is it possible to match each polygon to its border sharing polygon and number them?

For e.g. - Polygon 1 shares border with 2,4 and 6. So, they get a number 1, 2, 3. Similarly polygon 2 shares border with 1, 4,5,7. So on and so forth.

Main motto is to get this information to run a catchment of interest but exclude any polygons away from the core of the catchment. 

Attached is a sample catchment. Also image shows primary catchment in Blue and an outlier marked in red.

Please provide your valuable feedback. 

[Qiu · Accepted solution]

@Anudeep_Yalamuru 
Maybe I misunderstood your intention, but it seems that a Spatial Match tool can do the work.

[Anudeep_Yalamuru]

 Hi Qiu,

My quest was to in a way to find a way to keep the region of interest or catchment local. Like excluding the outlier polygon when i group the polygons to extract a single polygon, like a border. If the polygons are not touching or far away, the catchment extraction becomes difficult. I'm not sure if I'm able to make my case clearer but spatial match is perfect to find out the polygons whether they touch or intersect but question is how can i exclude them if they don't for a closed group. Thanks :)